2018 Volume 59 Issue 9 Pages 1483-1486
Silver nanoparticles (NPs) were fabricated using a high-pressure wet-type jet mill. A mixture containing both aqueous silver nitrate and a cellulose nanofiber (CNF) suspension was processed with the high-pressure wet-type jet mill at a pressure of 150 MPa. An X-ray diffraction pattern of the obtained sample revealed not only cellulose type I crystallites, but also silver metal crystallites. Transmission electron microscopy revealed silver NPs in the obtained sample that were spherical in shape with an average particle size of 7.1 ± 1.6 nm. These were much smaller than those in a sample prepared by a reflux method. Note that the particle size distribution was very narrow; moreover, almost all the silver NPs were well dispersed due to their constituent CNF. It was considered that Ag(I) was reduced to Ag(0) in the mixed suspension due to the many reducing functional groups on the surface of the raw CNF. It was concluded that cellulose acted as both a reducing agent and a dispersant.